Compilare: user.cpp: In function ‘void bfs()’: user.cpp:29:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < con[u].size(); i++) { ^ user.cpp:37:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < con[u].size(); i++) { ^ user.cpp:13:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘int main()’: user.cpp:48:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:49:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("statiuni.in", "r", stdin); ^ user.cpp:50:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("statiuni.out", "w", stdout); ^ user.cpp:51:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &K); ^ user.cpp:55:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &b); ^